everything that you suspect of might be the reason for your decline.
Also, you must accept that this procedure is not fully explored so far, as well as its effects on MS. They are two different conditions.
I remember just before the procedure, lying in the hospital bed and reading here on the forum posts of people who were disappointed, and I thought "This cannot be, this procedure must be the whole answer...". Find the thread of the letter of Dr. Simka, i think it explains everything. MS is caused by more factors. The procedure had its placebo effect on me for 5 mos, the last two I have been on and off with relapses. As soon as you realize this, you won't torture yourself with searching for answers. They are not available yet.
All the best,